for 'quick' cartridridge swapping,

There are some people who maintain that the head shell connections used can be problematic, and may over time suffer from corrosion or poor contact.

Furthermore, individual cartridges may require slightly different setup, especially if they weigh much more/less, which is hard to accomplish with headshells but easy with wands (which retain their unique setup with respect to balance, etc.) For these reasons, wands are somewhat preferred.

HTH

IMHO, VPI's JMW arms are the easiest to swap because all the adjustments are done on each individual wand. It takes about 15 sec to swap.

While you can set up the alignment in an interchangeable headshell and be done, you will still need to adjust for VTF and VTA whenever you swap (unless the second cartridge is a physical match) so it will take longer.

With an arm tube such as VPI, the counterweight is attached so once set, all that is needed to make a swap could be to reset VTA. Conveniently VPI provides a calibrated dial to do so. As Sidssp said, it only takes seconds to swap once all initial setups are dialed in.

But there is another advantage in using an arm with interchangeable headshells. You may be interested in reading some of Raul's posts on the importance of cartridge matching. This goes beyond the standard compliance/mass range that is often discussed. Raul discovered he could optimize performance of a given cartridge by experimenting with headshell rigidity and material type (resonance?), as well as weight with different model headshells.

So if you are interested in trying a few cartridges that are reported to work well in a VPI (or any other interchangeable wand arm that includes the counterweight), I would recommend that for ease and speed. But if you want to be able to optimize your arm/table to the greatest number of cartridge choices, you may want to go with a removable headshell arm.